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Four <br /> Start Evaluation of Consecutive YES <br /> Each Monitoring Well for Quarterly Sampling <br /> BTEX,TPH-Gasoline, Events <br /> Oxygenates,1,2-DCA, Completed? <br /> EDB,and TBA <br /> NO <br /> Quarterly Sampling Location <br /> of Well with <br /> Respect <br /> to Plume <br /> Upgradient Well <br /> MW-DIS-5 I I Crossgradient well I Well in Plume <br /> MW-DIS-6 I I I MW-DIS-1 <br /> MW-DIS-78 I Downgradient Well I MW-DIS-3 I MW-DIS-2 <br /> MW-DIS-OS I (To Be Installed) I MW-DIS-9 I NP-1-80 <br /> MW-DIS-BD I - I MW-DIS-10 I NP-1-90 <br /> MW-DIS-8D 1 1 <br /> I I I <br /> ND for YES ND YES Semi-Annual Sampling I ±.. NO <br /> ND for S Annual Sampling Semi-Annual Sampling <br /> Four No Sampling I Consecutive (First r1i Third Quarter) I (Third Quarter) i (First&Third Quarter} <br /> Consecutive Required I Events <br /> I 1 I <br /> NO I NO ,Semi-Annual SamplingQuarterly Sampling <br /> (First&Third Quarter} I i <br /> I <br /> I I I <br /> I I <br /> [Note.-Water level measurements to be collected quarterly <br /> Figure 4 <br /> Groundwater Monitoring Frequency <br /> Decision Tree <br /> DISCO Site,Stockton,CA <br /> 131420.A1.06•Dedsjon(3Rvd).FR0 -11/812000 mai sfo CH2MHILL <br />